Hypodermic syringe.



PATENTED FEB. 10, 1903.

J. N. RANGER. HYPODERMIG SYRINGE.

APVPLIOATION FILED NOV. 20. 1900.

H0 MODEL.

fn: NORRIS PEYERS 00.. PHOTO-LITHO.. wasumcn'ou, u c. l

UNITED STATES PATENT OFFICE.

JOHN NEWTON RANGER, OF EVANSVILLE, INDIANA.

HYPODERMIC SYRINGE.

SPECIFICATION formingpart of Letters Patent No. 720,381, dated February10, 1903.

Application filed November 20} 1900. fierialllo. 37,104. (No model.)

T0 whom it may concern:

Be it known that 1, JOHN NEWTON RANGER, a citizen of the United States,residing at Evansville, county of Vanderburg, State of Indiana, haveinvented certain new and useful Improvements in Hypodermic Syringes, ofwhich the following is a specification.

This invention relates to hypodermic syringes.

My object is to provide a hypodermic syringe of improved constructionand of few parts compactly arranged to render it of convenient size tobe easily carried in the pocket.

A further object is the provision of a hypodermic syringe which will belight and not liable to break or corrode and devoid of pack-' ing,washers, or other easily-breakable parts or such as will soon becomedamaged through use, so as to impair theusefulness of the syringe, mypurpose being to provide a syringe which will be strong, durable, andeasily rendered cleanly and aseptic, and thereby prevent the lodgment ofgerms and the disastrous results so often brought about by these defects in hypodermic syringes as usually constructed with joints.

Another object of myinvention is the provision of a hypodermic syringeadapted to carry for convenient access in a compact and novel manner themedicine to be used in connection therewith.

A still further object of the invention is to provide a hypodermicsyringe having fingergrips on the barrel or cylinder and independentprotecting-caps removably engaged with the barrel at the respective endsthereof and adapted to protect the needle-nipple and head of the piston.

Having the foregoing objects in view, the invention consists of ahypodermic syringe embodying certain improved features and novelcombinations of parts, all of which are set forth in detail hereinafterand recited in the appended claim.

In the accompanying drawings, Figure 1 is a view of the complete device;Fig. 2, a longitudinal section of the same; Fig. 3, a view with the capsremoved, showing the piston drawn out and'the needle in position; Fig.4, a detail view illustrating a modified form of piston-head, and Fig. 5an end view of the syringe.

By preference I construct the diiferent parts ofthe device of metal inorder to give strength and durability; but this does not preclude theuse of, other suitable materials.

The barrel or cylinder of the syringe is shown at 1, the same beingprovided with a tapered hollow needle-post 2 at one end and being openat its opposite end. Projecting from opposite sides of the barrel andrigidly connected thereto are finger-grips 3, having openingstherethrough for the insertion of the fingers of the user. These gripsare 10- cated'intermediate the ends of the barrel.

The numeral 5 designates the piston. This is a hollow cylinder closed atits inner end 6 and open at its opposite end, the same snugly fittingthe interior of the barrel in an air and fluid tight manner. The head 7of the piston is madein the form of a knurled plug having a flange8'overlapping the ends of the piston and the barrel and provided with ascrewthreaded portion 9, which is engaged with in terior screw-threadsin the mouth of the piston. As a substitute for the screw-threadedportion 9 I sometimes prefer to empioy a tapering plug 10, fitted in theswaged mouth of the piston, as shown in the modification of Fig. 4. Theexterior of the piston is provided with suitable graduations 11, whichby their coincidence with the mouth of the barrel indicate the amount offluid injected. The hollow cylindrical piston affords a convenientreceptacle for vials 12, containing tablets 13 of medicine intended tobe used with the syringe. Between the vials is packed the needle let,having the cap 15, which is to be fitted over the needle-post 2. Thevials and the needle (one or more may be used) are packed in the pistonand hold themselves there.

I employ caps 16 and 17, preferably rounded at their ends to give afinished configuration, which are fitted over the ends of the barrel orcylinder and held there by friction. It will be observed that these capshouse the piston-head and needle-post, respectively, protecting theentire syringe, and the grips 3 protrude from the sides of the barrelbetween the inner ends of said caps. By thus employing independent caps,which fit over the ends of the barrel and are there held by frictiononly and which have no intermediate connection with each other such aswould render the employment of grips projecting from the barrelimpossible, I am enabled to use a barrel provided with finger-grips andobtain the twofold advantage of being able to properly hold the devicewhen in use and keep it incased and protected when not in use.

The caps can be readily removed and the piston -head taken out and theneedle removed from the piston and placed on its post. One or moretablets can then be removed from one of the vials, dissolved, and theresulting liquid poured into the barrel and the piston inserted therein,whereupon the syringe can be used.

By the employment of a simple piston and barrel construction such as Ihave shown and described packing, rings, washers, and destructible partsare done away with and I provide a syringe which can be cleansed andrendered aseptic very easily and whose usefulness does not becomeimpaired after continued use. At the same time by the pro vision of ahollow piston as a receptacle for the medicines and the needles acompact springe is had, while the use of the caps protects the partswhen the syringe is not in use and at the same time permits the use ofgrips on the barrel.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-- The combination with a hypodermic syringehaving a barrel open at one end and provided with a needle-nipple at theother end and finger-grips connected thereto at its sides andintermediate or substantially midway its open and nipple ends, of ahollow piston in said barrel, a plu -screw threaded in said piston, aflange on said plug overlapping said piston and adapted to prevent thepiston from being forced too far into the barrel, and caps telescopingover the ends of the barrel and adapted to protect the plug and theneedie-nipple.

In testimony whereof I hereunto atfix my signature in presence of twowitnesses.

JOHN NEWTON RANGER.

\Vitnesses:

JOHN F. HARPER, P. O. RHOADES.

